... differential settlement 非均匀下沉 differential sign 微分符号 differential signal 差动信号，微分信号 ...
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数值差分、符号微分 diff
符号微分方程 dsolve ; symbolic differential equation
符号微分法 symbolic differentiation
数据差分、符号微分 diff
符号微分 symbolic differential calculus ; diff
微分和导数符号 Signs For Differentials And Derivatives
符号微分方程求解 Symbolic differential equation solution
拟微分算子符号 symbol of pseudo-differential operator
偏微分和偏导数符号 signs for partialdifferentials and partial derivatives
他以含有现代的微分符号和基本微分法则。
He includes a modern differential differential symbols and basic rules.
应该会有疑问的，而且还是不太相信微分，那么我的证明过程中，多次用到的微分符号，就有问题了。
Let's say that you are a true skeptic and you don't believe in differentials yet then it is maybe not very good that I actually used more of these differential notations in deriving the answer.
这除的仅仅是一个数，我并没有，捉弄你们，我们不知道，除以微分符号的意义，但我们知道除以一个数的意义。
Here I am just dividing Numbers so I am not actually playing any tricks on you. I mean we don't really know what it means to divide differentials, but dividing Numbers is something we know.
英文:differential; differentiation 1675年莱布尼兹分别引入「dx」及「dy」以表示x和y的微分（differentials）,.始见于他在1684年出版的书中,这符号一直沿用至今.微分符号d取英文differential,differentiation的首个字母(difference有差距,差额的意思),其中与微分概念及符号d相关的英文单词有divide,decrease,delta等.另外,符号D又叫微分算子. 关于微分有一个幽默笑话. 常函数和指数函数ex走在街上，远远看到微分算子，常函数吓得慌忙躲藏，说：“被它微分一下，我就什么都没有啦！”指数函数不慌不忙道：“它可不能把我怎么样，我是ex！”指数函数与微分算子相遇。指数函数自我介绍道：“你好，我是ex.”微分算子道：“你好，我是d/dy！”
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